新增车辆表及OTA权限与逻辑优化

新增车辆任务与报警表，完善实体与DbContext配置。细化OTA权限校验，增强回传会话IP安全。优化OTA上传与设置面板，调度器支持重启恢复。报警采集逻辑支持历史分段。

MiGu.Server/Fleet/AlarmCollector.cs

@@ -168,29 +168,36 @@ public sealed class AlarmCollector
         var activeByCar = new Dictionary<int, VehicleAlarmRecord>();
         foreach (var a in active) activeByCar[a.CarId] = a; // 每车取一条 active
 
-        // 出现 / 更新
+        // 出现 / 更新：文案或级别变化时先 clear 旧记录再开新 active，保留分段历史
         foreach (var cur in current.Values)
         {
             if (activeByCar.TryGetValue(cur.CarId, out var rec))
             {
-                rec.Info = cur.Info;
-                rec.Level = cur.Level;
-                rec.CarName = cur.CarName;
-                rec.LastAt = now;
-            }
-            else
-            {
-                db.VehicleAlarms.Add(new VehicleAlarmRecord
+                var same =
+                    string.Equals(rec.Info, cur.Info, StringComparison.Ordinal) &&
+                    rec.Level == cur.Level;
+                if (same)
                 {
-                    CarId = cur.CarId,
-                    CarName = cur.CarName,
-                    Info = cur.Info,
-                    Level = cur.Level,
-                    Status = "active",
-                    FirstAt = now,
-                    LastAt = now
-                });
+                    rec.CarName = cur.CarName;
+                    rec.LastAt = now;
+                    continue;
+                }
+
+                rec.Status = "cleared";
+                rec.ResolvedAt = now;
+                rec.DurationSecs = (long)Math.Max(0, (now - rec.FirstAt).TotalSeconds);
             }
+
+            db.VehicleAlarms.Add(new VehicleAlarmRecord
+            {
+                CarId = cur.CarId,
+                CarName = cur.CarName,
+                Info = cur.Info,
+                Level = cur.Level,
+                Status = "active",
+                FirstAt = now,
+                LastAt = now
+            });
         }
 
         // 消失 → 恢复

MiGu.Server/Fleet/CdmTaskRecord.cs

@@ -1,33 +0,0 @@
-namespace MiGu.Server.Fleet;
-
-/// <summary>
-/// CDM 搬运任务的平台侧快照（表 cdm_tasks）。
-/// 以任务 Id 为主键；SimpleLite/StandardScene 把终态任务从自身 JSON 里删除，这里则永久保留=完整历史，
-/// 且 SimpleLite 关闭后平台仍可从本表读取最近快照。
-/// </summary>
-public sealed class CdmTaskRecord
-{
-    public string Id { get; set; } = "";
-    public string? TaskId { get; set; }
-    public int MissionId { get; set; }
-    public string MissionName { get; set; } = "";
-    public string MissionTypeName { get; set; } = "";
-    public int SrcSiteId { get; set; }
-    public string SrcLabel { get; set; } = "";
-    public int DstSiteId { get; set; }
-    public string DstLabel { get; set; } = "";
-    public string Status { get; set; } = "";
-    public string StatusCode { get; set; } = "";
-    public int? CarId { get; set; }
-    public string? CarName { get; set; }
-    public int Priority { get; set; }
-    /// <summary>下发/开始/结束时间：直接存投影返回的 ISO 字符串（可空）。</summary>
-    public string? CreateTime { get; set; }
-    public string? StartTime { get; set; }
-    public string? FinishTime { get; set; }
-    public string? StuckReason { get; set; }
-    public bool Overdue { get; set; }
-    /// <summary>平台首次/最近一次同步到该任务的时间。</summary>
-    public DateTimeOffset FirstSeenAt { get; set; }
-    public DateTimeOffset LastSeenAt { get; set; }
-}

MiGu.Server/Fleet/VehicleAlarmRecord.cs

@@ -1,29 +0,0 @@
-namespace MiGu.Server.Fleet;
-
-/// <summary>
-/// 车辆报警的平台侧记录（表 vehicle_alarms）。
-/// SimpleLite 只在 SSE/状态里给出「当前是否报警 + 文案」，无历史；平台按车对帐：
-/// 出现报警→开一条 active 记录，报警文案变化→更新，报警消失→置为 cleared 并记录恢复时间/持续时长。
-/// 永不删除=完整历史，重启/刷新不丢，SimpleLite 离线也可查。
-/// </summary>
-public sealed class VehicleAlarmRecord
-{
-    public string Id { get; set; } = Guid.NewGuid().ToString("D");
-    public int CarId { get; set; }
-    public string CarName { get; set; } = "";
-    /// <summary>报警文案（车体_AlarmInfo）。</summary>
-    public string Info { get; set; } = "";
-    /// <summary>报警级别（车体_AlarmLevel，未知为 0）。</summary>
-    public int Level { get; set; }
-    /// <summary>active | cleared</summary>
-    public string Status { get; set; } = "active";
-    public DateTimeOffset FirstAt { get; set; }
-    public DateTimeOffset LastAt { get; set; }
-    public DateTimeOffset? ResolvedAt { get; set; }
-    /// <summary>持续时长（秒），恢复后写入。</summary>
-    public long? DurationSecs { get; set; }
-    /// <summary>预留：平台侧确认（不代表车端消警）。</summary>
-    public bool Acknowledged { get; set; }
-    public DateTimeOffset? AcknowledgedAt { get; set; }
-    public string? AcknowledgedBy { get; set; }
-}